Cassidy is a Newfoundlander with a life-long passion for performing on stage. He attended a school for performing arts in Missouri, indulging his special interest in dance and went on to join the Mid-American Dance Company before moving back to Canada.
With family in the UK, Cassidy moved to live in England and after trying his hand at stand-up comedy, he eventually joined 42 Commando Royal Marines.
It was while serving on his second tour in Afghanistan in 2011 as a Marine (medic) that he lost a leg in an IED blast.
After meeting director Stephen Rayne and writer Owen Sheers, he was offered the lead role of the eponymous Charlie in the first highly successful UK tour of "The Two Worlds of Charlie F" working with Sir Trevor Nunn and Ray Winstone on the Bravo 22 play which brings some awareness to the audience of soldiers' experiences after injury, with a cast of real military personnel.
2012 was a busy year, Cassidy married his fiancée Laura and he was delighted to be asked to carry the Olympic Torch as the relay passed through Peterborough. He was pleased to try skiing again too.
More recently he has been the face of The British Legion Poppy Appeal and has filmed a guest lead role in BBC Doctors. He has also appeared in short films and had wide media coverage in the National Press, with further interviews on TV and Radio, including Radio 4's Mid Week with Libby Purves and This Morning with John Humphries.
Cassidy recently became a naturalised British Citizen and he and Laura live near Peterborough. In 2014 he has reprised the role of Charlie F in a UK tour preceded by performances in Canada.